In a small microwave-safe bowl, whisk together granulated sugar, cocoa powder, water, canola oil, brown sugar, vanilla extract, and a pinch of salt until fully combined.
Add the all-purpose flour and stir until just combined, being careful not to overmix.
Stir in the semi-sweet chocolate chips evenly into the batter.
Microwave on high power for about 1 minute, or until the brownie is set in the center to your desired doneness. Check at 45 seconds and adjust cooking time if needed in 15-second intervals.
Optionally top with ice cream or whipped topping and serve immediately. Best enjoyed warm and fresh.
Notes
The brownie does not store well; enjoy immediately for the best taste and texture. Feel free to experiment with different types of baking chips or add nuts for variety.